Magnetic machine for operating on bolts, nuts, and the like



June 10, 1930 Q i w, mcfi 1,762,192

MAGNETIC MACHINE FOR OPERATING ON BOLTS, NU TS, AND THE LIKE Filed Dec. 51, 1925 SSheetS- Sheet 1 MATroRNEY w. B. PEIRCE June 10,1930.

MAGNETIC MACHINE FOR OPERATING ON BOLTS; NUTS, AND THE LIKE Filed Dec. .31, 1925 5 Sheets-Sheet 2 June 10, 1930. 1,762,192

MAGNETIC MACHINE FOR OPERATING 0N BOLTS, NUTS, AND THE LIKE v w. 5. PEIRCE Filed Deb. 51, 1925 5 Sheets-Sheet [I :1 INVENTOR 23 William B. P627 6 Willi/Ill!!! M ATTORNEY June 10, 1930. w. B. PEIRCE 1,762,192

MAGNETIC MACHINE FOR OPERATING ON BOLTS, NUTS, AND THE LIKE Filed Dec. 31, 1925 '5 Sheets-Sheet 4 INIVENTCR ,Wz'llzam B. Pezrz'e J June 10, 1930.

W. B. PEIRCE MAGNETIC MACHINE FOR OPERATING ON BOLTS, NUTS, AND THE LIKE Filed Dec. 31, 1925 5 SheetsSheet INVENTOR Wi'llzam 3- P6 1 rev:- 33 .4

M ATTORNEY Patented June 10, 1930 Hair-so STATES PATENT OFFICE WILLIAM B. PEIRCE, 'OF CQRAOPOLIS, PENNSYLVANIA, ASSIGNOR TO PITTSBURGH SCREW & BOLT CORPORATION, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA MAGNETIC MACHINE FOR OPERATING ON BOLTS, NUTS, AND THE LIKE Application filed. December 31, 1925. Serial No. 78,508.

My present invention is shown as embodied in an automatic machine for screwing nuts on bolts,'but it involves several entirely novel combinations of elements capable of use in other relations. a v 1 One feature of the invention is a magnetlc holder for bolts in which bolts are non-positively but securely held,'preferably' so that they may be rotated or moved lengthwise for various purposes without displacement; A-

novel' embodiment is where a plurality of the bolt holders are formed in the periphery of a turret and. there is a single magnetic field energizing all of the bolt holders and the magnetic field is closed through the shanks of the bolts when in position-on the holder. The field is strongenough so that bolts fed are automaticallypulled into the holders at .high speed by the power of the magnet, thus making it practical to operate at high speed with the bolts presented in proximity to the periphery of the turret by the ordinary inclined guideway of the type commonly em- .ployed for feeding nuts and bolts. Another feature is making the peripheral poles of the magnet vertically adjustable for various lengths of bolts, also the magnetic bolt holder elements removable so that the periphery may I be equipped with different. bolt holding notches to accommodate bolts of different diameter. I V

Another feature of the invention isa mag netic nut holder which is revolved at high speed. Like the bolt holder, it has the advantage of pulling into position thereon, nuts fed'in proximity thereto. The nut supporting element is a plane, preferably horizontal. circular surface, the area of which comprises two semi-circular poles of a magnet, the poles being separated by a relatively thin strip of non-magnetic material, preferably brass. The remarkable,and indeed phenomenal,feature of this construction is, that the nut attracted to andrestingon this surface, rotating at high speed, is not thrown ofl by centrifugal force, but, on the contrary, is instantly, automatically and perfectly centered on said surface. This is primarily because it tends to bridge the poles that form part of the magnetic circuit, it e g ges. this surface fi mly,

both by reason of its own weight and by reason of the magnetic attraction. As a result, it

as the magnet and then, being-itself an annulu's, it becomes further stabilized by centrifugal force. I V a The bolts being held in the magnetic holders on the turret clutch are indexed into regis- Novel holding back mechanism is employed wherebythe nutsare freed, one at a time, for the magnetic transfer to the nut holding magnet. This holding back mechanism is an escapement operated only by a nut which has been screwed on the end of a bolt. Hence, if any imperfection causes failure of threading of the. nut on the bolt, such nut remains on the chuck for threading on the next following I bolt, because the escapement does not operate to release a second nut.

l/Vhi'le have shown the bolt holding turret or chuck asused only in combination with the nut applying chuck, it is obvious it can be used in combination with a bolt pointer or a nut threader; also it affords a verydesirable means for feeding bolts or the like, one by one, to or from any other desired mechanism, as,for instance, a threader.

The above and other features of my invention maybe more readily understood from the followin description in connection with c accompanying drawings, in wh1chnuts onto bolts is theonly operation to be performed;

Fig. 2 is a longitudinal section on the broken dotted line 22, Fig. 1; Fig. 3 is a planrview of thebolt holding turret; 7

same on the line 4-14, Fig. 3 Fig. 5 is a detail per pe tive show ng the the' Fig. 1. is a top plan View of an embodiment Q0 ofthe invention, in which the screwing ofquickly acquires the same speed of rotation I Fig. 4 is a vertical axial .section ofthe.

arrangement of removable bolt holding pole pieces of the turret;

Fig. 6 is a plan view of the magnetic nut holder;

Fig. 7 is an enlarged side elevation of the same, similar to the showing in Fig. 2, except that parts of the interior construction of the magnet are indicated in axial section;

Fig. 8 is a horizontal section on the line 88, Fig. 2; and

Fig. 9 is a detail view on the line 99,

V Fig. 1.

In Fig. 1, the assembly is shownas comprising a suitable supporting table, A, above which is supported the bolt holding turret, B, in operative relation to the nut holding magnet chuck, C, the bolt supplying means being indicated at D and the nut supplying means at E.

As shown in 2, the bolt holding turt'tical position by set screw 12. These parts are of magnetic material and constitute a magnetic circuit for magnetizing coil 10 which surrounds sleeve 3 and is supported by head 5. The annular heads or flanges, 5 and 8, carry similar pole pieces, 13, which form the extreme terminals or poles of the magnetic circuit which is completed by the shanks of the bolts 00 when the latter are in position. The vertical distance between upper and lower cooperating p-ole pieces may be adjusted for longer and shorter bolts by loosening the locking screw 12 and sliding hub 6 up or down on the cooperating sleeve member 3.

The pole pieces are made removable and replaceable to suit the diameters of the bolts used, yet are maintained functionally integral parts of the magnetic circuit by the construction shown in'detail perspective in 'Fig. 5. This figure, in connection with Figs. 3 and 4, makes it clear that the flange or head, 8, has the bolt holding elements, 13, clamped against the lower face thereof by dogs or clamping members, 14, secured by screws, 15. 2' The outer ends of members 13 are formed with notches adapted to fit the bolts to be used, the rear face, 13*, being substantially radial to afford a square backing for the bolt when in position and the forward face, 13 being inclined outward in the direction of rotation to permit the bolt to approach its seat diagonally instead of limiting this movement to a strictly radial one. The holding pole pieces, 13, are secured against tangential or skewing displacement in the plane of the head by radial guideways which are formed by adjacent edges of the quadrant segment plates, 16, which are of magnetic material and similarly shaped plates, 17, which are of brass or other non-magnetic material, the iron and brass segments being secured together by screws 18 and both secured to head 8 by screws 19.

The non-magnetic segment, 17, projects a substantial distance beyond the periphery of the magnetic segment, 16, so as to space the bolts away from the head, preventing undue attraction and sticking thereof until approach of the notched magnetic holders, 13. The segments, 16, 17, afford guideways which do not have to be changed when smaller bolts are used, the widths of all sets of pole pieces, 13, being the same, only the size of the notches being different.

Current may be supplied to coil 10 in any desired way, as, for instance, by contact rings 19, 20, supported in insulation, 21, on the lower face .of lower head, 5, cooperating stationary brushes, as 22, 23, being supported in any desired way on table A. One of the rings is of course'wired to one end of magnet coil 10 and the other to the other end of said coil.

As shown in Figs. 6 and 7, the nut holding chuck C comprises a magnetic disc-like member, 25, supporting magnet windings, 26, 27, for the respective legs of the magnet, the latter comprising core' pieces, 28, 28, secured to by screw 29 and terminating in pole pieces, 30, 31, having closely confronting pole surfaces, 32, 33, separated by brass or other non-magnetic material, 34. These pole pieces and intervening non-magnetic material present a horizontal circular nut holding surface, 35, exposed above the top of support A which at this point is formed with an inserted brass plate, 36, because too close approach of iron to the poles would shunt too much of the magnetic circuit, around through other parts of the machine.

The above described magnet of the nut chuck is mounted upon stud shaft, 40, which is provided with a screw thread portion, 41, screwing into the above described magnetic disc or yoke member, 25. The shaft, 40, has a collar, 41*, resting upon pole bearing, 42, on the upper end of the journal 43, in which shaft rotates. The journal 43 is carried by yoke 44 secured to the under surface of support A by bolts 45.

Current for energizing coils 26, 27, is supplied in any desired way. through conducting rings 46, 47, embedded in insulating material 48, on the rotating parts 40, 25 and contacting with stationary bushes 49, in insulation support 51 carried by yoke 44.

The bolt supply .means,.D, comprises the usual inclined guides 60, 60, engaging the the bolt engaging notches.

heads of the bolts m with the shanks running down between the guides. The guides may be adj ustably supported as by stud screws 61, 61 on one side and 62, 62 ontheother side engaging an inverted U-shaped support,63, V secured by bolts Get to the table A. Bolts are supplied in continuous train either by hand or by well known automatic hopper mechanism commonly employed for this purpose. Passing down the guideway by gravity in a continuous train, they are presented to the magnetic bolt holding turret as indicated in Fig. 2. They are prevented from falling off the guideway 'by engage ment with the above described brass guard segments, 17, which project around the periphery of the turret, flush with the ends of l/Vhen a notch comes opposite a bolt, the latter is immediately pulled into the notch by magnetic attraction, completing the magnetic circuit between the upper and lower pairs of notch members. While this action is usually certain and accurate enough for all practical purposes, I may employ a pusher finger, 65, on a slide, 66, mounted in guides 67 vertically adjustable in a vertical supporting plate, 68, secured to the table A bybolts 69. The plate 68 has vertical slots, 7 O, in which the clamping bolts 71 secure'the guide 67 at any desired elevation. The elevation is preferably such as will bring the pusher into engagement with the bolt about midway between the upper and lower holding notches. The slide is non-positively urged towards the bolt by spring, 78, its forward movement being adjustably limited by the bolt, 7%, the head of which contacts with the rear face of guide 67. The slide is retracted once for every indexing movement of the turret by positive means such as a roller, 79, engaging a cam. 79-, rotating with the drive mechanism which will be described below.

Onthe other side of the guideway is a similarconstruction of support, 68 slide, 66-, retracting spring, 73, screw stop, 74, etc, but in this case there is no retracting means, the end of the pusher being formed with a cam surface, 89, slightly overlapping the path of movement of the outermost portion of the bolt shank when it is properly positioncd in the holder 13. The purpose'of this is to yieldingly wipe the bolt and press it backward into firm engagement with bottom of the notch. V

The nut supplying means, E, is shown as comprising an inclined guide-trough, 80, "ipted to fit the smaller diameters of the nuts. The nuts slide down the trough and a considerable number of them are maintained in train so that the lowermost nut may move promptly by gravity pressure when the release mechanism operates. Atthe lower end of the trough is'an automatic cscapement whereby the lowermost nut is the tained in the nut stopping position by spring,

8 1. Projecting beyond the lever arm, 82, is a contact member, 85, in. the path of travel of the .nuts when they are screwed on the bolts and carried around by the turret. There is a spring pressed clamping pin, 86, on the opposite, side of the trough, normally engaging with the next nut of the series and preventi-ng pressure thereof on the last nut which is in Contact with dog 81, but this clamping pin.

is normally held out of engagement with the second nut by a stud, 87, adjustably secured in a bracket, 88, on the lever arm 82. Therefore, when a nut screwed on a bolt in the turret engages and withdraws stop 81, the pin 86 is simultaneously released by retreat of stud 87, thereby permitting it to clamp the second nut before the dog 81 completely releases the last nut. As soon as dog 81 has been carried clear of the last nut, it is drawn automatically onto the chuck surface, 35, of the rotating magnet and is automatically surrendered as described above. contact member 85 is freed of engagement with the nut, the spring snaps stop 81 back into position and simultaneously retracts clamping pin 86, thus releasing the train ofnuts and instantly feeding another nut against stop 81. Obviously, the escapement will not work unless a nut has been screwed onto the bolt. Just beyond the nut feeding and supplying mechanism is arranged a stripper guideway, 90, located inthe path of the bolt and operating to strip the same radially out of the notch of holder 13.

Driving the above described parts is simplifled by reason of the fact that the bolt and nut magnets operate as substitutes for bolt and nut transfer mechanisms. The means here employed will be evident from Figs. 2 and 8. An important feature is the combination with the non-positive magnetic bolt holder of indexing mechanism of a type peculiarly adapted to start and stop the indexing movement as gradually as possible in order that this movement may be accomplished at high speed without throwing off the boltsfrom the magnet surface, by shock combined with centrifugal force. A suitable, well known mechanism which I have selected for this novel combination is. the Geneva stop shown more clearly in Fig. 8. The shaft 1, rotating As soon as the.

the bolt holderB, is intermittently driven Y through rotor 100, having slots 101 engaged by roller 102 eccentrically located on rotor 103 on shaft 1. On the rotor 100, between slots 101, are true cylinder surfaces, 104, adapted to engage the cylinder surface 105, which is integral with rotor 103. The latter surface is broken by a re-entrance surface 106 symmetrically located with-respect to the roller 102, so that the slot ends of rotor 100 may have clearance when the rotor 102 engages one of the slots. As will be evident from the drawing, slots 101 are tangential to the orbit of roller 102 and are at right angles to'each other sothat shaft 1 is rotated through a quadrant during the period of engagement of roller 102 with each of the four slots. The index position of the'bolt holders is of course midway between the driving slots 101, so that they are held stationary during three-quarters of a revolution of 103, because one of the cylindrical segments, 104, will" be accurately fitting the cylinder 105 and therefore holding shaft 1 in the index position.

Shaft 1 may be driven at desired constant speed through beveled gear 107, by pinion 108 on shaft 109, supported in bearing 110. If the pusher finger is used, this shaft 1* will also carry the cam 79 for contact with the roller 79, to retract the pusher.

Vhile the nut holder C does not have to be actually synchronized with the rest of the driving mechanism, it is obviously desirable to have the speed at least sufficient to screw the nut onto the bolt during the time that the bolt holder is stationary in its index position, and as it is often possible to speed up the whole mechanism, I have preferred to drive the nut holder from a large gear, 111, on shaft 1*, intermediate gear 112 on stud shaft 113 and pinion 114 on the nut holder shaft 40. By using the intermediate gear 112, the direction of rotation of the nut is right-hand for screwing onto the bolt. The multiplying ratio of these gears may be anything desired, but I have found the ratio shown practically satisfactory when the machine is driven at a speed for nutting, say, or more bolts per minute.

From the above, the operation of the device will be obvious. A supply of bolts is maintained on the slides at D, either by hand or well-known automatic machinery. A supply of nuts is similarly maintained in trough 80. The drive shaft 109 is rotated at desired speed. The roller 102 of the Geneva stop engages a slot, 101, every revolution, rotates it 90 and leaves it locked. Gear 111 rotates with the driving member of the Geneva stop and causes high speed rotation of the nut holder through the multiplying gears 112,

114. Whenever the notches of the magnetic bolt holders 13 come opposite the bolt, the

bolt is instantly pulled into the notch and bridges the magnetic circuit between the upper and lower poles. If the pusher is used, the spring73 will cause it to follow up the bolt with a regulated pressure assisting in surface 11 of the notch. In the secondposition, nothing is being done with the bolt, but it is obvious that any desired operation may be performed on it while in this position. As shown, however, nothing happens until the next indexing movement, which brings the bolt to the position shown at :0, where the bolt is moved axially downward and held from rotation, preferably by an automatically acting wrench, indicated in dotted lines at 116, although this operation could be performed by hand if desired. Here the bolt, 00, finds a nut properly centered and rotating at high speed in such a direction that the nut is instantly screwed onto the bolt. The next indexing movement brings the nut carried by the bolt into engagement with the escapemcnt member 85, releasing another nut while holding back the supply in the trough 80, the free nut being instantly drawn to the magnetic nut chuck while the remainder of the indexing movement carries the nutted bolt by the stripper guides 90, leaving the notch empty for the next indexing movement to the bolts of supplying mechanism.

The nut chuck could be located at the fourth index position, the stripper being between it and the first or bolt supplying position, leaving the second and third positions avalilable for any desired operation by other too s.

It will be noted further with respect to the turret to the periphery of which the bolts are held by magnetism, that there is advantage in having four or more of the bolt holders with a correspondingly large number of indexing positions, even though operation on the bolt is tobe Performed only in one of the index positions. The advantage is that each indexing step carries the bolt through a smaller angle, thus developing less centrifu gal force for a given rate of nutting and in dexing operations. For instance, if the turret had but two diametrically opposite bolt holding notches, the turret would be indexed a full-half revolution, or 180, and for a given rate of nutting the centrifugal force tending to throw the bolt off the turret would be much greater, say, four times as great. On he other hand, it is obvious that any desired number of bolt holders, with a corresponding number of small angle indexing steps, may be had by gearing the Geneva stop to the turret shaft instead of having it mounted directly thereon.

The above examples are merely illustrative of the fact that the principle of my novel magnetic bolt holder, as also of my novel magnetic nut chuck, will be found useful in a great variety of relations for handling a variety of articles of magnetic material other than bolts and other than nuts.

The reactions involved in the automatic centering of the nut on the flat surface of the magnetic chuck seem to be complex, and while the utility ofthis part of my invention V is entirely independent of theory, I may note that the magnet has a widely distributed magnetic field attracting the nut from a distance; that the lines are much more concentrated along the diametric line of separation of the poles of the magnet, and that they are progressively more concentrated toward the periphery of the support surface. It seems important, therefore, that wehave means for establishing regions of-major, approximately equal magnetic attraction, approximately equidistant from the center of rotation and symmetrically disposed with respect to said axls.

At the periphery, the gap between the poles is rotating at high speed, Whereas at the center the speed is zero. Hence, at the periphery the magnetic lines cut into and out i of the approaching, non-rotating nut at very high speed, as compared with similar lines near the axis. Anyway, the net result of this seems to be a sort of magnetic vortex generating such reactions that the ironnutis sucked in and centered with respect to the axis before it picks up speed enough to really stick on the magnet surface. The fact that the magnet-engaging face of the nut is crowned may contribute mechanically to the centering effect.

However these things may be, the fact:

remains that the device operates most effectively as a self feeding and centering chuck,

and the most obvious reason is that in the position shown in dotted lines in Fig. 6, the nut short-circuits more magnetic lines than in any other position, which is only another way of saying that the magnet attracts'it to that position more strongly than to any other and the nut manages to get to that position before it gets stuck on the magnetic surface.

I claim: c 1. A nutter for bolts, including a rotary magnetic bolt holder for attracting and holding bolts, in combination with a rotary magnetic nut chuck for attracting, automatically centering and rotating nuts, and means for rotating said bolt holder and presenting the threaded end of a bolt on the holder in register with a nut on the rotating chuck. Y

2. A nutter'for bolts, including a rotary magnetic bolt holder having pairs of cooperating unlike poles adapted to be bridged by a bolt, in combination with a rotary nut chuck for automatically centeringand rotat- 55 ing nuts introduced transversely of the axis of rotation of said chuck, and means for rotating said bolt holder and presenting the threaded end of a bolt on theholder in regis-- ter with a nut on the rotating chuck.

3. A nutter for bolts, including a vertical rotary bolt holder for holdingbolts in spaced relation, in combination with a vertical rotary magnetic nut chuck for attracting and automatically centeringand rotating nuts,

said nut chuck having a flat circular upper end of substantially the radius required to accommodate the outside dimensions of one of said nuts, means to guide said nuts to the edge of said upper end, and means for. re

senting the threaded end of a bolt on the holder in register with a nut on the rotating chuck.

4. A nutter for bolts, including a rotary bolt holder for holding bolts in spacedrelation, in combination with a rotary magnetic nut chuck for attracting andautomatically centering and rotating nuts, said chuck affording a horizontal nut supporting surface comprising segments of different polarities arranged symmetrically with respect to the axis of the nut chuck and of which ma'gmeans for indexing the turret through angles corresponding to the spaces between the poles, in combination with a magnetic nut chuck mounted for rotation on an axis aligning with the bolt in one of the indexed positions of the bolts on the turret, means for rotating the chuck at high speed to createa rotating. magnetic field attracting, automatically centering and non-positively rotating nuts presented thereto, and means for presenting free bolts and nuts to be attracted by.

the holder and chuck respectively.

6.' A nutter for bolts, including a rotary turret provided witha plurality of pairs of cooperating magnetic poles of unlike polarity, designed to fit the shank of a bolt bridged across them, means for indexing the turret through angles corresponding to the spaces between the poles, in combination with a nut chuck adapted to rotate a nut in a fixed plane and mounted for rotation on an axis aligning with the bolt in one of the indexed positions of the bolts on the turret, means for rotating the chuck at high speed to create a rotating'magneticfiel'd adapted to attract,

automatically center and non-positively ro tate the nuts presented thereto. v

7. A nutter for bolts, including a rotary turret provided with a plurality of pairs of cooperating magnetic poles of unlike polarity, designed to fit the shank of a bolt -bridged across them, means for indexing the turret through angles corresponding to the spacesbetween the pairs, in combination with a nut chuck adapted for rotating a nut in a xed plane and mountedfor' rotation on an axis aligning with the bolt in one of the indexed positions of the bolts on the turret, means for. rotating the chuck at high speed to create a rotating.magnetic field adapted to attract, automatically center and non-positively rotate the nuts presented thereto, and means for. supplying bolts and nuts to the holder and chuck respectively.

' 8. A nutter for bolts, including a rotary turret provided with a pluralityotspaced apart bolt holders, means for indexing the turret through angles. corresponding to the spaces between the holders, in combination with means, including a magnetic chuck mounted for rotation on an axis aligning with the bolt in one of the indexed positions of the holder, for attracting nuts introduced from the side, automatically centering them on the nut chuck, and rotating them to screw them on corresponding bolts brought to such indexed position.

9. A nutter for bolts, including a vertical rotary turret, provided with a plurality of spaced apart bolt holders, means for indexing'the turret through angles corresponding to the spaces between the holders, in combi nation with a magnetic nut chuck'for attracting, auton'iatically centering and rotating' nuts mountedtor, rotation. on a vertical axis, aligning with the bolt in one of the indexed positions of the holder, means for supplying bolts to the holder, means for rotating said magnetic chuck at relatively high speed, and means to present to the surface at the upper end of said magnetic chuck, free, non-rotative nuts to be automatically centered and rotated thereby.

10. A nutter for bolts, including a turret, means for indexing the turret, the turret being provided With a plurality of bolt holders spaced so that each corresponds to an indexed position of the turret, each bolt holder comprising spaced apart magnetic pole pieces of unlike polarity, with notches arranged to have their magnetic lines short-circuited through said shank, and concentric guard segments of non-magnetic material for bold ing back the bolts at points intermediate the bolt holders, in combination with a rotor having its axis registering with one of the indexed positions of the bolts and adapted to perform operations on each when in said position.

11. A nutter for bolts, includingv a turret, a GQHQVZL stop for indexing the turret, the turret being provided with a plurality of a bolt holders spaced. so that each corresponds to an indexed position ofthe turret, each bolt holder comprising spaced apart magnetic pole pieces of unlike polarity, with notches I arranged to have their magnetic lines short-circuited through said shank, and concentric guard segments of non-magnetic material for holding back the bolts at points intermediate the pole pieces, in combination with a magnetic nut chuck having its vertical axis registering with one of the indexed. positions of the magnetic bolt holders.

12. A nutter for bolts, including a turret, a Geneva stop for indexing the turret, the turret being provided with a plurality of bolt holders spaced so that each corresponds to an indexed position of the turret, each bolt holder comprising spaced. apart magnetic pole pieces of unlike polarity, with notches arranged to have their magnetic lines short-circuited through said shank, and concentric guard segments of non-magnetic material for holding back the bolts at points intermediate the pole pieces, in combination with a magnetic nut chuck having its vertical axis registering with one of the indexed positions of the magnetic bolt holders, and formed with a surface comprising segments which are unlike poles of an electro-magnet, the legs and coils of the magnet being .approximately symmetrical with the axis of the chuck, means for rotating said magnet chuck at relatively highspeed.

13.,A nutter for bolts, including a, turret, a Geneva stop for indexing the turret, the turret being provided with a plurality of bolt holders spaced so that each corresponds to an indexed position of the turret, each bolt holder comprising spaced apart magnetic pole pieces of unlike polarity, With notches arranged to have their magnetic lines short-circuited thraugh said shank, and concentric guard se 'ments of non-magnetic material for holding back thebolts at points intermediate the pole pieces, in combination with amagnetic nut chuck having its verticalaxis registering with one of the indexed positions of the magnetic bolt holders, and formed with a surface comprising segments which are unlike poles of an electro-magnet, the legs and coils of the magnet being approximately symmetrical with the axis of the chuck, means'for rotating said magnet chuck at relatively high speed, and means for presenting to said surface, free, non-rotating nuts to be automatically centered and held thereby.

14. A nutter for bolts, including a turret, a Geneva stop for indexing the turret, the turret belng provided with a plurality of bolt holders spaced so that each corresponds to an indexed position of the turret, each bolt holder comprising spaced apart magnetic pole pieces of unlike polarity, with notches arranged to have their magnetic lines shortcircuited through said shank, and concentric guard segments of non-magnetic material for holding back the bolts at points intermediate the pole pieces, in combination with a magnetic nut chuck having its vertical axis registering with one of the indexed positions of the magnetic bolt holders, and formed with a surface comprising segments which are unlike poles of an electro-magnet, the legs and coils of the magnet being approximately symmetrical with the axis of the chuck, means for rotating said magnet chuck at relatively high speed and means for presenting to said surface, tree, non-rotating nuts to be auto-.

matically centered and held thereby; said means including an inclined guideway in which a train of nuts is maintained and an automatic escapement having a trip located outside of the path of travel of the shank of the'bolts in the bolt holder, but within the path of travel of nuts that have been screwed thereon.

15. A nutter for bolts, a Geneva stop for indexing the turrent, the turret being provided with a plurality of bolt holders spaced so that each corresponds to an indexed position of the turret, each bolt holder comprising spaced apart magnetic pole pieces of unlike polarity, with notches arranged to have their magnetic lines shortcircuited through said shank, means for presenting successive bolts each with its shank adjacent to and in alignment with successive pairs of bolt holders and a cam wiper adjacent the bolt supplying means for pressing the shank into the notches, in combination with a magnetic nut' chuck having its'vertical axis registering with one of the indexed positions of the magnetic bolt holders.

16. A nutter for bolts, including a turret,

a Geneva stop for indexing the turret, the turret being provided with a plurality of bolt holders spaced so'that each corresponds to an indexed position of the turret, each bolt holder comprising spaced apart magnetic pole pieces of unlike polarity, with notches arranged to have their magnetic lines shortcircuite d through said shank, means for presenting successive bolts each with its shank adjacent'to and in alignment with successive pairs of bolt holders, concentric guard segments of non-magnetic material for holding back the bolts at points intermediate the pole pieces, in combination with a magnetic nut chuck having its Vertical axis registering with one of the indexed positions of the mag netic b-oltholders.

17. A nutter for bolts, including a turret,

a Geneva stop for indexing the turret, the turret being provided with a' plurality of bolt holders spaced so that -each corresponds to an indexed position of the turret, each bolt holder comprising spaced apart magnetic pole pieces of unlike polarity, with notches arranged to have their'magnetic lines shortcircuited through said shank, means for. pre senting successive bolts each with its shank adjacent to and in alignment with successive pairs of bolt holders, concentric guard segments of non-magnetic material for holding back the bolts at points intermediate the pole pieces, in combln'atlon wlth a magnetic nut chuck having its vertical axis registering with'one of the indexed positions of the magnetic bolt holders, and formed with a surface including a turret,

comprising segments which are unlike poles of an electro-magnet, the legs and coils of the magnet being approximately symmetrical with the axisof the chuck, means for rot-ating said magnet chuck at relatively high speed, and means for presenting to said surface, tree, non-rotating nuts to be automatically centered and held thereby, said means including an inclined guideway in which a train of nuts is maintained and an automatic escapement having a trip located outside of the path of travel of the shank of the bolts in the bolt holder, but within the path of travel of nuts that have been screwed thereon.

18. A nutter for bolts, including a turret, means for indexing the turret, bolt holding means on the turret at positions correspond ing to indexed positions of the turret, means;

for presenting successive bolts of such bolt holding means, in combination with a magnetic nut chuck having its vertical axis registering with one of the indexed positions of the bolt holding means, and formed with a" surface comprising segments which areun like poles of an electro-magnet, the legs and coils of the magnet being approximately symmetrical with the axis of the chuck, means for rotating said magnetic "chuck at relatively high speed, and means for presenting to said surface, free, non-rotating nuts to be automatically centered and held thereby, said means including a guideway in which a train of nuts is maintained and an automatic escapement device having atrip located outside of the path of travel of the bolts carried by the, turret but within the path of nuts that have been screwed thereon;

' 19; A bolt machine, including a turret on a vertical axis, a Geneva stop for indexing the turret, the periphery of the turret being axis of the turret, spaced apart to correspond with the indexed positions of the turret, each 7 bolt holder comprising a pair ot axially spaced magnetic pole pieces of unlike polarity, with notches adapted to be bridged by the shank of a bolt or the like,' 1neans for presenting-successive bolts, each with its shank adjacent to the periphery of the turret in alignment with successive pairs of bolt holding poles, concentric guard pieces of non-magnetic materialtor holding back the bolts at points between the notches, in combination lie with a rotating nut holder having its vertical axis'regis'tering with one of theindexed positions of the bolt holders.

'20. Abolt machine, including a turret on a vertical axis, aGeneva stop for indexing the turret, the periphery of the turret being provided with bolt holders parallel with the axisof the turret, spaced apart to correspond with the indexed positions of the turret, each bolt holder comprising a pair of axially spaced magnetic pole pieces of unlike polar x ity, with notches adapted to be bridged by the shank of a bolt or the like, means for presenting succeisive bolts, each with its shank adjacent to the periphery of the turret in alignment with-successive pairs of boltholding poles, a cam wiper adjacent the bolt supplying means for pressing the shank into the notches, in combination with a rotating nut holder having its vertical axis registering with one of the indexed positions of the bolt holders.

21. A bolt machine, including a turret on a vertical axis, a Geneva stop for indexing the turret, the periphery of the turret being provided with bolt holders parallel with the axis of the turret, spaced apart to correspond with the indexed positions of the turret, each bolt holder comprising a pair of axially spaced magnetic pole pieces of unlike polarity, with notches adapted to be bridged by the shank of a bolt or the like, in combination with a rotor having its axis registering with one of the indexed positions of the bolts and adapted to perform operations on each when in said position.

'22. A bolt machine, including a turret on a vertical axis, a Geneva stop for indexing the turret, the periphery of the turret being provided with bolt holders parallel with the axis of the turret, spaced'apart to correspond with the indexed positions of the turret, each bolt holder comprising a pair of axially spaced magnetic pole pieces of unlike polarity, with notches adapted to be bridged by the shank of a bolt or the like, means for pre senting successive bolts, each with its shank adjacent to the periphery of the turret in alignment with successive pairs of bolt holding poles, concentric guard pieces of nonmagnetic material for holding back the bolts at points between the notches, in combination with a rotor having its axis registering with, one of the indexed positions of the bolts and adapted to perform operations on each when in said position.

23. A bolt machine, including a turret on a turret, the periphery of the turret being provided with bolt holders parallel with the axis of the turret, spaced apart to correspond with the indexed positions of the turret, each bolt holder comprising a pair of axially spaced magnetic pole pieces of unlike polarity, with notches adapted to be bridged by the shank of a.bolt or the like, means for presenting successive bolts, each with its shank adjacent to the periphery of the turret in alignment with successive pairs of bolt holding poles, a cam wiper adjacent the bolt supplying means for pressing the shank into the notches, in combination with a rotor having its axis registering with one of the indexed positions of the bolts and adapted to perform operations on each when in said position.

' 24. A bolt machine, including a turret on a vertical axis, a Geneva stop for indexing the turret, the periphery of the turret being provided with bolt holders parallel with the axis of the turret, spaced apart to correspond with the indexed positions of the turret, each bolt holder comprising a pair of axially spaced magnetic pole pieces of unlike polarity, with notches adapted to be bridged by the shank of a bolt or the like, means for presenting successive bolts, each with its shank adjacent to the periphery of the turret in alignment with successive pairs of bolt holding poles, concentric guard pieces of nonmagnetic material for holding back the bolts at points between the notches; a cam wiper adjacent the bolt supplying means for pressing the shank into the notches, in combination with a rotor having its axis registering with one of the indexed positions of the bolts and adapted to perform operations on eachwhen in said position.

25. 'A carrier for bolts and other elongated articles of magnetic material, including an electro-magnet having axially spaced apart poles formed with cooperating aligned notches adapted to be bridged by the magnetic article, means for moving said carrier to a bolt receiving position and to a bolt delivering position means for presenting successive bolts to successive sets of aligned notches as the notches are brought to the bolt receiving position, and concentric guards of non-magnetic material betweenthe notches to hold back the bolts.

26. A turret and means for indexing the turret, the turret being provided with bolt holders for holding bolts with their shanks parallel with the axis of the turret, in combination with a rotary magnetic chuck having its axis registering with one of the indexed positions of the bolt holders and formed with a horizontal'upper surface comprising two semi-circular segments which are closely confronting poles of an electro-magnet, the legs and coils of the magnet being approximately symmetrical with the axis of the chuck, together with means for rotating said magnetic chuck at relatively high speed.

27. A turret and means for indexing the turret, the turret being provided with bolt holders for holding bolts with their shanks parallel with the axis of the turret, in combination with a rotary magnet chuck having its axisregistering with one of the indexed positions of the bolt holders and formed with a horizontal upper surface comprising two semi-circular segments which are closely confronting poles of an electro-magnet, the legs and coils of the magnet being approximately symmetrical with the axis of the chuck, to gether with means for rotating said magnetic chuck at relatively high speed, and means for presenting to said surface, free, non-rotating nuts to be automatically centered and held. thereby.

28. A turret and means for indexing the turret, the turret being providedwith bolt holders for holding bolts with their shanks parallel with the axis of the turret, in combination with a rotarymagnetic chuck having its axis registering with one of the indexed positions of the bolt holders and formed I with a horizontal upper surface comprising two semi-circular segments which are closely confronting poles of an ele'ctro-magnet, the legs and coils of the magnet being approxi-v mately symmetrical with the axis of the chuck, together with means for rotating said magnetic chuck at relatively high speed, and means for presenting to said surface, free,- non-rotating nuts to be automatically cen tered and held thereby, said means including an inclined guideway in which a train of nuts. is maintained and an automatic escapement having a trip located outside of the path of travel of the shank of the bolts in the bolt holder, but within the path of travel of nuts that have been screwed thereon. l

29. A turret for carrying elongated articles of magnetic material, including an electromagnet having as core elements, concentric cylinders each terminating in a radial disc and each disc terminating in a plurality of nuts tosaidflat-upper end including a support of non-magnetic material surrounding said fiat upper end and with the upper surface of said support forming substantially ing formed and arranged to create a rotating magnetic field adapted to-attract, automatically center and non-positively rotate nuts presented adjacent thereto, and a magnetic bolt holder with poles spaced apart longitudinally of the axis of the chuck and formed with bolt engaging and centering surfaces adapted for non-positively holding a bolt in g alignment with the axis of said chuck while permitting movement toward said chuck.

Signed at Coraopolis, in the'county of Allegheny and State of Pennsylvania, this 28th day of December, A. D. 1925.

' 'WILLIAM B. PEIRGE.

cooperating, spaced apart poles formed with cooperating aligned notches adapted to be bridged by the magnetic article, windings for oppositely magnetizing the discs and means for relative axial adjustment of the discs to suit the length of the magnetic article, in combination with means for rotating said carrier to an article receiving position and to an article delivering position. p

30. A turret for carrying elongated articles of magnetic material, including an electromagnet having as core elements, concentric and each disc terminating in; a plurality of cooperating, spaced apart poles formed with cooperating aligned notches adapted to be bridged by the magnetic article,.windings on the inner cylinder for oppositely energizing the discs, means for relative axial adjustment of the discs to suitthe length of the magnetic article, and the outer cylinder be ing of sufficient diameterto encompass said winding, in combination with'means for rotating said carrier to an article receiving position and to an article delivering position.

31. A nutter for-bolts, including a vertical rotary turret provided with spaced bolt holders to hold bolts parallel to the axis of the turret, means for indexing theturret through angles corresponding to the spaces between the holders, in combination with a magnetic nut chuck mounted for rotation on an axis aligning with the bolt in one of the indexed positions of the bolts on the turret, said nut chuck having a flat upper end of suflicient size to accommodate the outside dimensions of one of said nuts, and means to guide said 

